JP6074204B2 - Filling method for underground pipe - Google Patents

Description

The present invention relates to a method for filling underground pipes in which various conduits buried in the ground are filled with a filler.

Numerous conduits are buried in the ground to form conduits for various uses such as modern water and sewage, gas, electricity, communications, and the like. When these underground pipes are no longer used for reasons such as aging, it is necessary to fill the inside of the pipe with mortar and fluidization. For this purpose, a filling port is provided at the upstream end of the pipe line, a reaching port is provided at the downstream end of the pipe line, and a filler having fluidity is sent from the filling port toward the downstream side. A method of filling with the filler is employed. In this type of in-conduit filling method, as shown in Patent Documents 1 and 2, the filler is pressurized from the upstream filling port with a pump and fed into the pipe line, so that the filling material reaches the downstream arrival port. Is disclosed. Further, Patent Documents 3 and 4 show a method of sending a filler from a filling port to the reaching port by sucking the filling material at the filling port from a downstream reaching port with a vacuum pump or the like.

On the other hand, in many buried conduits, there is an overhanging portion that rises after descending from the upstream to the downstream, and an overhanging portion that descends after rising. Hereinafter, in this case, when calling the two without distinction, they are referred to as “overhead”. In these crossover portions, if only a fluid filler is sent downstream from the filling port by the pressure feeding or suction, a void may remain in the crossover portion or a pipe line in the vicinity thereof. This has been confirmed by the inventors of the present application. When this gap is large, if the filling work is completed with the gap left, the inside of the buried pipe may be collapsed from the gap, which may cause a road collapse or the like.

JP 2000-145400 A JP 2007-309384 A JP-A-53-13286 Japanese Patent No. 4920630

In the above-described underground pipe filling method, when setting the filling part and the reaching part, excavation into the ground at both points, cutting the buried pipe line, It is desirable to make the distance from the filling part to the arrival part (hereinafter referred to as the pumping distance) as long as possible from the viewpoint of shortening the construction period and shortening the traffic regulation time such as roads. It is where
However, there is a limit to the pump that pumps the filling material, and the above-mentioned crossing portion is provided in the pipe line. Filling may not be possible. Therefore, the conventional method has a limit in extending the pumping distance.
An object of the present invention is to provide an underground pipe filling method that makes it possible to extend the pumping distance by using an overpass that has been an obstacle to extending the pumping distance.

The present invention provides a filling part at the upstream end of a pipe line buried in the ground, a reaching part at the downstream end of the pipe line, and pumps a filler having fluidity downstream from the filling part. Thus, the filling method of the underground pipe that fills the pipe with the filler is improved.
As the pipe line, one having an overpass portion that rises and descends as it goes from the upstream side toward the downstream side is selected. Then, when performing the pumping step of pumping the filler downstream from the filling portion, the suction step of sucking the air in the pipeline and the filler from the air vent hole provided in the lifting portion is performed. Features.
In addition, although the said air vent hole can utilize what is provided as an existing installation in the uplift part of filling object, in the uplift part in which the air vent hole is not provided, it is newly provided. It may be.
In carrying out this filling method, it is efficient to select a pipeline having a plurality of the overheads as the pipeline. Then, first, an overdraft portion close to the filling portion is selected, and a suction step of sucking air and the filler in the pipe line from the air vent hole of the selected overdraft portion is performed together with the pressure feeding step.
Then, after confirming that the filler has reached the confirming step of confirming the arrival of the filler to the lifted portion that has performed this suction step, from the lifted portion that has performed the confirmation step A suction step for selecting the uplift portion located downstream, and sucking the air and the filler in the pipe line from the air vent hole of the selected uplift portion, and the above-mentioned to the uplift portion that has performed this suction step And a confirmation step for confirming the arrival of the filler.
The suction step and the confirmation step are sequentially performed on the downstream uplift portion, thereby filling the reaching portion.
When performing the suction step, a confirmation step of closing the air vent hole of the other over-lifting portion and closing the reaching portion and confirming the arrival of the filler to the over-winding portion close to the reaching portion. After performing, it is desirable to open the reaching portion and perform filling up to the reaching portion.

In the present invention, the filling portion, which is a section where voids are easily formed during filling, is actively used for the suction process, and air in the pipe line and the above-described air are removed from the air vent hole provided in the raising portion. By performing the suction process of sucking the filler, it is possible to provide a filling method for underground underground pipes that can extend the pumping distance.

It is explanatory drawing of the filling method which concerns on embodiment of this invention. It is explanatory drawing of the pipe line which comprises an overhead part.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Target pipe line)
The in-conduit filling method of the present invention is to fill the inside of a pipeline for various uses such as water and sewage, gas, electricity, communication, etc. with a fluid filler, and is buried in the ground. Although the main object is a conduit, a similar filling method can be used for above-ground and aerial conduits. The pipe is composed of one or a plurality of pipes, and the material of these pipes is generally synthetic resin, metal, concrete, etc., but the method of the present invention is applied regardless of the material. can do.

At least a part of this pipe line is provided with an uplift portion 12 curved so as to descend after rising from the upstream toward the downstream. In addition to the overturning portion 12, Kandeki may be provided with a curved portion while maintaining a horizontal state, an overhanging portion, a horizontal straight pipe, and the like.

FIG. 2 is an enlarged view of one uplift portion 12 of the pipe line in FIG. 1, and the details of the uplift portion 12 will be described with reference to FIG. This pipe has an upstream on the left side and a downstream on the right side. The straight pipe 13, the first bend pipe 14, and the straight pipe arranged obliquely are arranged from the upstream to the downstream. Pipe 15, second bend pipe 16, straight pipe 17 arranged horizontally, third bend pipe 18, straight pipe 19 arranged diagonally, fourth bend pipe 20, straight pipe 21 arranged horizontally Each tube is connected in the order of. In addition, each pipe | tube does not need to be one and may connect several. The section of the bend pipe 14 to the bend pipe 20 constitutes the raising portion 12. An air vent hole 31 (32, 33, 34) is provided at the highest position (in this example, the straight pipe 17) of the overturning portion 12. This air vent hole 31 (32, 33, 34) is usually provided as an existing device part in many uplift parts 12, but if it is not present, it can be newly laid.

(Filler)
Various fillers having various fluidities such as mortar such as slurry mortar and soil mortar, fluidized soil, and synthetic resin can be used as the filler. As this filler, one having a flow value of about 350 to 450 mm is suitable. However, the present invention is not limited to this, and the filler can be appropriately changed and implemented on the condition that pumping or suction is possible.

(Setting of filling part and reaching part)
Since the normal pipe line is arranged in the ground or the like in a continuous state, the pipe line is cut in a certain section, the filling part 22 is set at the upstream end, and the reaching part 23 is set at the downstream end. The length of the section for setting the filling portion 22 and the reaching portion 23 may be several meters at the minimum value, and the maximum value is obtained by increasing the number of places that suck the inside of the pipeline from the air vent holes 31 to 34. Theoretically, the distance can be extended indefinitely, but in practice, it is considered that it can be carried out without difficulty if it is up to about 700 m. Specifically, the filling portion 22 and the reaching portion 23 each seal the end of the pipeline with the sealing member 24. A filling port 25 is provided above the sealing member 24 of the filling unit 22, and a reaching port 26 is provided above the sealing member 24 of the reaching unit 23. The filling port 25 is a thin tube body into which a filler can be fed, and a closing valve is provided as necessary to allow opening and closing. The arrival port 26 is a thin tube body for discharging the reached filler or the like, and is provided with a closing valve as necessary so that it can be opened and closed. Further, as necessary, each sealing member 24 of the filling part 22 and the reaching part 23 is provided with an air vent 27 at the upper part and a water vent 28 at the lower part. The air vent port 27 and the water vent port 28 are thin tubes that can discharge air or water in the pipeline, and can be opened and closed by providing a closing valve as necessary.

(Filling into the conduit)
The filling of the conduit according to the present invention is carried out as a pumping process in which the filler is sent downstream from the filling port 25. In this step, the filler is pumped from the upstream filling port 25 to the downstream arrival port 26, and the filling material is pumped downstream by a pump (not shown) connected to the filling port 25. The type of the pump is not particularly limited, but a sand pump, a squeeze pump, or the like used for various filling operations in the field of civil engineering and construction can be used.

In carrying out this pressure feeding method, as shown in FIG. 2, the filling portion 22 and the reaching portion 23 may be set with one lifting portion 12 interposed therebetween, but in order to increase the filling distance, FIG. As described above, it is efficient to set the filling portion 22 and the reaching portion 23 with a plurality of upward portions interposed therebetween. In FIG. 1, four sandwiched portions are illustrated, but this number can be changed as appropriate.

(Filling method)
Hereinafter, with reference to FIG. 1, the filling method when the filling part 22 and the reach | attainment part 23 are set on both sides of a some overhead part with the filling method of this invention is demonstrated in order.
In the example of FIG. 1, four raising portions are arranged from upstream to downstream, and air vent holes 31 to 34 are arranged in each raising portion.

(First suction step: FIG. 1 (A))
First, when a pump is connected to the filling port 25 of the filling unit 22 to perform the pressure feeding step of filling the filling material, the overflow portion closest to the filling unit 22 is selected, and the air in the pipe line and the air vent hole 31 are selected from the air vent hole 31. A first suction step for sucking the filler is performed. At this time, it is desirable that the other air vent holes 32 to 34 and the reaching portion 23 be closed.
This suction step can be performed by connecting a suction pump such as a vacuum pump to the air vent hole 31. The vacuum wheel is stopped in the vicinity of the air vent hole 31 and the vacuum pump is connected to the air vent hole 31. By doing so, the pump can be easily moved.

(Confirmation process)
The confirmation process confirms that the filler has reached the air vent hole 31 (FIG. 1B). When the arrival of the filler is confirmed, the process proceeds to the second suction step. In addition, after confirming that the filler has arrived, a reverse feeding step of moving the filler upstream can be performed by reversing the suction pump or the like. By this reverse feeding process, it is possible to reduce a gap portion that may be formed around the bend pipe in the upward portion. After performing the reverse feeding process, the suction may be performed again, or the process may move to the second suction process without performing the suction.

(Second suction step: FIG. 1C)
A second suction step for sucking the air and the filler in the pipe line from the air vent hole 32 downstream of the air vent hole 31 that has performed the first suction step is performed together with the pressure feeding of the filling from the filling portion 22. At that time, it is desirable that the other air vent holes 31, 33, and 34 and the reaching portion 23 be closed.
(Confirmation process) In the confirmation process, it is confirmed that the filler has reached the air vent hole 32. When the arrival of the filler is confirmed, the process proceeds to the third suction process.

(Following process)
The suction step and the confirmation step are sequentially performed on the downstream uplift portion. That is, the third suction process from the air vent hole 33 (FIG. 1D) and the fourth suction process from the air vent hole 34 (FIG. 1F) are performed.

(Reaching part 23)
Finally, all the air vent holes 31 to 34 are closed, and filling up to the reaching portion 23 is performed (FIG. 1 (G)). At that time, suction may be performed by connecting a suction pump to the filling port of the reaching portion 23.

As described above, the present invention can be variously modified. For example, suction may be performed from a plurality of air vent holes. Specifically, when the first suction step is performed, a pump is connected to the air vent hole 31 and the air vent hole 32 downstream thereof, and suction is performed from two locations, and the filler reaches the air vent hole 31. If it is confirmed, the air may be sucked from the air vent hole 32 and the air vent hole 33 on the downstream side. Moreover, you may make it carry out the pumping of a filler from the air vent hole which has reached the filler in addition to or instead of the filler. Specifically, after the completion of the first suction process, a filler pump for pumping the filler may be connected to the air vent hole 31 to pump the filler toward the downstream air vent hole 32.

22 Filling portion 23 Reaching portion 31 Air vent hole 32 in the first overpass portion 32 Air vent hole in the second over portion 33 Air vent hole in the third over portion 34 Air vent hole in the fourth overpass portion

Claims (3)

By providing a filling portion at the upstream end of the pipeline buried in the ground, providing a reaching portion at the downstream end of the pipeline, and pumping a filler having fluidity downstream from the filling portion, In the underground pipe filling method of filling the pipeline with the filler,
The pipe line is provided with a rising portion that rises and descends as it goes from the upstream side toward the downstream side,
When performing the pumping process of pumping the filler from the filling portion downstream,
From the air vent hole provided in the overhead part, the suction process of sucking the air in the pipe line and the filler with a suction pump is performed,
For the filler, a filler having a flowability of 350 to 450 mm selected from the group consisting of mortar, fluidized soil, and synthetic resin is used.
The pressure-feeding of the filler from the filling portion is to pump the filler with a sand pump or a squeeze pump,
The pipeline includes a plurality of the overturning portions,
A lifting part close to the filling part is selected, a suction step of sucking air and the filler in the pipe line from the air vent hole of the selected lifting part, and the suction part to which the suction step is performed And a confirmation process to confirm the arrival of the filler,
After confirming that the filler has arrived, select an overdraft located downstream from the overdraft where the confirmation step has been performed, and air in the pipeline from the air vent hole of the selected overdraft And a suction step for sucking the filler, and a confirmation step for confirming the arrival of the filler to the overpass portion that has performed the suction step,
The suction step and the confirmation step are sequentially performed on the downstream rising portion, thereby filling the reaching portion.
When performing the suction step, close the air vent hole of the other overhead portion, and close the reach portion,
After performing the confirmation step of confirming the arrival of the filler to the overhanging portion close to the reaching portion, the reaching portion is opened, and filling to the reaching portion is performed. Filling method. 2. The filling method for an inlaying pipe according to claim 1, wherein after confirming that the filler has arrived in the confirmation step, a reverse feeding step of moving the filler upstream is performed. In addition to being performed from the filling portion at the upstream end of the pipe line, or in place of the filling portion, the pressure feeding step is to pump the filling material downstream from an air vent hole that has reached the filler. 3. The filling method for a buried pipe according to claim 1 or 2.